Trigger circuit for photo multiplier tube (CB8661E)

This circuit was found in a 90s Electronic Engineering. The circuit has the tube's critical element. Operational amplifiers support equivalents.

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Volume limiter (CB25287E)
This circuit for audio signals was found in the March 1990 Radio Electronics magazine. The circuit...
Sinusoidal Oscillator 4093 (CB21123E)
In the figure we have the way to implement a sinusoidal oscillator with the 4093 IC. The component...
Complementary Transistors Monostable (CB19362E)
Equivalent transistors, like the BC548 and BC558 pair can be used in this circuit that we find in an...